please close - problem solved
Is the servo spank brand new? If not, what is the history?
Before you take it out of the plane however, try this!
If you have an extension on the servo, try replacing it with another one just for kicks. I've had servos bouce before and this for one reason or another has corrected the problem. If that doesn't do it, twist the leads and extensions and try it again. If the servo is in fact good, one of these things should work. Let me know_Bob